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Finding the Fourth Proportional to 873.80, 1,309.91 and 434.76

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Solution

The fourth proportional to 873.80, 1,309.91 and 434.76 is: 651.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.80 : 1,309.91 = 434.76 : x
  2. Step 2: Convert to fraction form
    873.80/1,309.91 = 434.76/x
  3. Step 3: Cross multiply
    873.80x = 1,309.91 × 434.76
  4. Step 4: Simplify right side
    873.80x = 569,494.30
  5. Step 5: Solve for x
    x = 569,494.30/873.80
  6. Step 6: Final answer
    x = 651.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.